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Need help with door tag decode, 1991 F800

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Old 08-11-2017, 03:22 PM
telescope-tech telescope-tech is offline
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Need help with door tag decode, 1991 F800

Transmission code on the door VIN sticker is AC

The motor is a 7.8 and the transmission is an automatic with a PTO.
I'm looking at the 1991 ford specification book, volume 3 (truck) and I don't see anything with that code. All the other numbers on the tag make sense.
I'd love to avoid driving 6 hours RT just to find this truck has an Allison AT545.
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Old 08-12-2017, 12:21 PM
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Originally Posted by telescope-tech View Post
Transmission code on the Certification Label is AC
AC = Allison model MT-653 Automatic Transmission.
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Old 08-12-2017, 08:02 PM
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Originally Posted by NumberDummy View Post
AC = Allison model MT-653 Automatic Transmission.
Thanks, I didn't get this in time so I drove up and crawled under what is now my new truck. :-)

Now I need to find a charge-cooler since the 1990 didn't have one. :-(
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